But there's another unpredictable player in OPEC that folks should be watching: Libya.

"Libya is the only other real OPEC supply wild card to the upside for 2016," an RBC Capital Markets team led by Helima Croft wrote.

"With over a million barrels currently shut-in due to the ongoing security and political challenges, it remains one of the few OPEC countries that could theoretically put substantial quantities of additional oil on the market this year," the team added.

Things have been chaotic in Libya since Muammar Gaddafi was overthrown in 2011, as two rival governments and numerous armed groups have been competing for power.

But back in mid-December, delegates from the various Libyan factions signed a deal to form a national unity government. Now some analysts think this could be a major turning point for the country and, subsequently, could mean that its oil may soon get back on the market.

Croft's commodities team argued, however, that "despite the progress, it is excessively soon to start penciling in the return of large quantities of additional Libyan barrels in the near term." The team cited two big reasons:

This new government is meeting in Tunisia (as opposed to Libya), and key stakeholders have criticized the agreement or have not participated in the process.

Libya is looking at an emerging security threat, the Islamic State, that seems keen on damaging Libya's energy infrastructure. "Unlike in Iraq and Syria, the goal of the Islamic State in Libya is not to operate the energy infrastructure to generate revenue, but to deliberately destroy it," Croft's team wrote.

"In a more benign environment, we could envision a scenario where Libyan production climbed back up to around 950 kb/d (the October 2014 high), however given the security situation, we fear that any broader political resolution between the country's two competing governments may not prove a silver bullet in bringing the Libyan barrels back," Croft concluded.

In short, Libya has indeed made progress with the deal to form the national unity government, but there are still serious and unpredictable headwinds to its stability.